Rachel Weisz almost crushed by Game of Thrones horse

Actress Rachel Weisz had a scare while riding a horse in her new film My Cousin Rachel.

The horse used in the film was trained to "die" when its left rein was pulled, but no one told Rachel, who was almost thrown when the creature went down.

"I had to learn to ride side-saddle, which was a first, which is challenging in a corset and a big dress," she tells Reuters.

"He (the horse) had been trained on Game of Thrones to die when you pulled his left rein very sharply, which I didn't know, so I cantered out of shot and stopped and pulled the left rein, and he very gracefully buckled his front legs and his back legs and 'died' on his left side, which was the side I was on... It was a terrifying moment because I didn't know if I'd get crushed."